Perhaps you should try some spelling variations:
thanh than » thanh thanh, thanh thang, thanh toan
minh thanh » dinh thanh, tinh thanh, hinh thanh
than cua » nhan cua, thai cua, ban cua
su sach » so sach, vu sach
cam duc » cao duc, pham duc, nam duoc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
y tang » ky tang, 6 tang, 7 tang
ma hoi » xa hoi, ma hoa, me hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y tang ((ma hoi) or (mai hoi)). hieu ve ((cam duc) or (cam xuc)) minh thanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y tang ((ma hoi) OR (mai hoi)). hieu ve ((cam duc) OR (cam xuc)) minh thanh than cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y tang ((ma hoi) or (mai hoi)). hieu ve ((cam duc) or (cam xuc)) minh thanh than cua tre*.